Device for preventing transmission of shocks in liquid conduits



Aprfll 29 1929., J. H5N1. HEHNDQRF A lmlg DEVICE FOR4 PREVENTINGTRANSMISSION OF vSHOCKS IN LIQUID CONDUITS Filed Oct. 2, 1.928

coco/00000 Q occoooc'nwo Patented Apr. 2," 1%29.

nutren stares JOSEPH HERMANN M t. i: i

f racaal2 HEINQORF, OF HAMBURG, GERMNY.

DEVICE FQR PREVENTING TRANSMISSION Oli." SHOGKS IN HQIIPYCNDUITS.

Application ledl. October 2, 1928, Serial No. 309,718, and in GermanyApril 28, 1926.

rllhe invention relates to a device for preventing transmission of backshocks in liquid conduits for protection of liquid meters byautomatically shutting 0E -the passage of the liquid.

A device according to the invention comprises a. perforated -hollowslide which in Fig, 2 is a similar view illustrating a modiicationincluding an air-vessel walled by an air-hose.

Fig. 3 is a view showing a further modification in which the cushioningmeans is constituted by a manometer element.

Fig. 4 shows yet another modification including a yielding diaphragm.

By way of the supply connection 1 water enters the annular compartment 2of the casing 3 which is subdivided into compartments 2 and 4 by thepartition 5. 6 denotes a perforated cylindrical guide located within thecasing 3. 7 denotes a hollow slide or piston fitted within the cylinder6 and similarly perforated. initially the slide 7 occupies, under v theaction of gravity, its lowermost position as shown. By way of a smallopening 8 water under pressure enters the hollow slide 7 from below, andmoves it upwardly. Con-v sequently, the perforations 9 of the slide 7are brought into register with the perforations of the cylinder 6,allowing water to pass from the compartment 2 into the interior of thehollow slide 7 and thence to the upper compartlnent 4 and thence to thedischarge connection 10.

Back shockwillbe taken up mainly by the top of the hollow slide 7 whichin a single stroke is moved to bring the perforations in the slide andin the guide out of register whereby to cut o the flow.

In order to preventk transmission ofthe shock to the supply side of theconduit on commencementof the movement a yielding device or cushion isarranged within the hollow slide 7.

As shown in Fig. 1 this cushion consists of an air lvessel 11 disposedin the upper part of the hollow slide, and communicating with theinterior of the hollow slide by way olfy a comparatively small opening.

1n the construction shown inFig. 2 a rod 12 screwed into the bottom ofthe casing projects'into the hollow slide and is provided preferably atits ends with flanges 13 to which a iexible hose 14 is attached by cords15. When pressure is set up within the casing, the hose 14, filled withair, will be compressed and thus serve as a cushion.

In the construction shown in Fig. 3' the cushion is constituted by axnanometer element 16 arranged within a compartment 17 communicatingwith the casing '3. i

lin the construction shown in' Fig. 4 shocks are cushioned by a iexiblediaphragm 18 forming part of the wall of the casing below the slide 7,and exposed on one side to the liquid and one the other side to theatmosphere.

, l claim v 1. A device for preventing transmission of back shocksinliquid conduits for the protection of liquid meters, by automaticallyshutting off the passage of liquid through said conduits, comprising aconduit, .a hollow guide anda hollow pistonreciprocable in said guide,said guide and piston having registrable perforations, saidperforationsin one part communicating with the inlet portion of saidconduit and in another part with the outlet portion of said conduit sothat said guide and piston constitute a valve for said conduit, saidguide being provided with a permanently open bleed passage adn'littingiuid from the inlet portion of said conduit piston forming part of thewall of the outlet ice 2 u y mon/,oie

, portion of said conuit whereby saidl piston' cushioning Ineens beingconstituted by :in air is operable by impact-oi the liquid in saidvessel coinn'iunicnting with the interioiI of the outlet portion, tomove said poi'forutions out. hollow piston by Way of a comparatively 10of registry, and. means providing an air small opening. o 5 cushionpositioned so as to be nti'ected by 1in testimony whereof l have signedmy Huid pressure within said piston. naine to this speciiioation.,

ZQA. device 4as claimed in claim l, the JOSEPH HERMANN MAMA HEINDOM..

